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Unformatted text preview: BICD 100 – Genetics TA: Kathleen Yip Section Handout #3 Office Hours: F 9-10am, CLICS study tables, first floor Exam #1 Info: • Average: ~ 85% for scantron section. Good job! • Answer keys will not be online. Want to see the questions/answers? See me. Summary of lecture 7 & 8 • Aneuploidy –an increase or decrease in one chromosome (i.e. trisomy 21 [2n+1] produces Down syndrome) and caused by nondisjunction • Polyploidy – having >2 haploid sets of chromosomes. Most common in plants • Nondisjunction – an error in either meiosis I and/or II • Primary Down Syndrome – having three copies of chromosome #21 • Familial Down Syndrome (refer to Figure 9-23 on p.253) – usually caused by chromosomes 14 & 21, in which one of the two #21’s attaches itself to #14 through a Robertsonian translocation. o Study Figure 9-23 (pg. 253) really well! Know why the ratios happen (for example, there are no Study Figure 9-23 (pg....
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- Spring '08
- Genetics, half normal embryos, eggs complete meiosis, embryos. b. Meiosis, embryos. c. Meiosis, embryos. d. Meiosis, half abnormal embryos